body,
html {
    position: absolute;
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}
canvas {
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #fff 0%, #333 100%);
    cursor: pointer;
}
#textures {
    position: absolute;
    visibility: hidden;
}